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Environmental exposures to toxic gases were monitored after a tanker truck carrying ammonium-nitrate (6484522) and fuel-oil ignited near (SIC-8062) Morgantown, West Virginia on December 9, 1980. The surrounding area was evacuated and road blocks established to protect persons from possible exposure to toxic gases. The chemical contents of the truck were allowed to burn off. Air quality measurements for nitrogen-dioxide (10102440) and carbon-monoxide (630080) indicated that the surrounding area was free of toxic gases and the area was reopened to the public approximately five hours after the start of the fire.